<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <!-- 展示用户个人购物车商品的地方 -->
      <div class="cart-body">
        <ul
          class="cart-list"
          v-for="(good, index) in cartInfoList"
          :key="index"
        >
          <li class="cart-list-con1">
            <input
              @change="changeChecked(good, $event)"
              type="checkbox"
              name="chk_list"
              :checked="good.isChecked"
            />
          </li>
          <li class="cart-list-con2">
            <img :src="good.imgUrl" />
            <div class="item-msg">
              {{ good.skuName }}
            </div>
          </li>
          <li class="cart-list-con4">
            <el-tag type="danger">{{ good.skuPrice }}</el-tag>
          </li>
          <li class="cart-list-con5">
            <a href="javascript:void(0)" class="mins" @click="minu(good)">-</a>
            <input
              autocomplete="off"
              type="text"
              :value="good.skuNum"
              @change="update(good, $event)"
              minnum="1"
              class="itxt"
            />
            <a href="javascript:void(0)" class="plus" @click="add(good)">+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{ good.skuNum * good.skuPrice }}</span>
          </li>
          <li class="cart-list-con7">
            <el-popconfirm
              :title="`你确定删除商品?`"
              @confirm="remove(good.skuId)"
            >
              <el-button type="danger" size="mini" slot="reference"
                >删除</el-button
              >
            </el-popconfirm>
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <input
          :checked="isSelected"
          @change="changeCheckeds"
          class="chooseAll"
          type="checkbox"
        />
        <span>全选</span>
      </div>
      <div class="option">
        <a @click="removeAll">删除选中的商品</a>
        <a>移到我的关注</a>
        <a>清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">
          已选择 <span>{{ totalCount }}</span
          >件商品
        </div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{ totalPrice }}</i>
        </div>
        <div class="sumbtn">
          <router-link class="sum-btn" to="/trade">结算</router-link>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import { add } from "nodemo";
import { mapGetters } from "vuex";
//按需引入
import throttle from "lodash/throttle";
import debounce from "lodash/debounce";
export default {
  name: "ShopCart",
  //组件挂载完毕:先获取一次当前用户的购物车的数据
  mounted() {
    // this.$store.dispatch("getUserCart");
    this.getData();
  },
  computed: {
    ...mapGetters(["cartInfoList"]),
    totalPrice() {
      return this.cartInfoList.reduce((pre, next) => {
        if (next.isChecked == 1) {
          pre += next.skuNum * next.skuPrice;
        }
        return pre;
      }, 0);
    },
    totalCount() {
      return this.cartInfoList.reduce((pre, next) => {
        if (next.isChecked == 1) {
          pre += next.skuNum;
        }
        return pre;
      }, 0);
    },
    isSelected() {
      return this.cartInfoList.every((list) => {
        return list.isChecked == 1;
      });
    },
  },
  methods: {
    async changeChecked(good, $event) {
      //商品id
      let skuId = good.skuId;
      //商品勾选状态
      let isChecked = $event.target.checked ? 1 : 0;
      try {
        await this.$store.dispatch("updateChecked", { skuId, isChecked });
        this.$message({
          type: "success",
          message: "商品状态修改成功!",
        });
        this.getData();
      } catch (error) {
        this.$message({
          type: "error",
          message: "商品状态修改失败!",
        });
      }
    },
    async add(good) {
      let skuId = good.skuId;
      let skuNum = 1; //变化的数量
      //发送修改数量的请求
      try {
        await this.$store.dispatch("updateSkuNum", { skuId, skuNum });
        this.$message({
          type: "success",
          message: "商品数量修改成功",
        });
        this.getData();
      } catch {
        this.$message({
          type: "error",
          message: "商品数量修改失败",
        });
      }
    },
    minu: throttle(async function (good) {
      if (good.skuNum > 1) {
        let skuId = good.skuId;
        let skuNum = -1;
        try {
          await this.$store.dispatch("updateSkuNum", { skuId, skuNum });
          this.$message({
            type: "success",
            message: "商品数量修改成功!",
          });
          this.getData();
        } catch (error) {
          this.$message({
            type: "error",
            message: "修改数量失败!",
          });
        }
      }
    }, 2000),
    update: debounce(async function (good, $event) {
      let skuId = good.skuId;
      let skuNum = $event.target.value * 1;
      //非法
      if (isNaN(skuNum) || skuNum < 1) {
        skuNum = 0;
      } else {
        //合法的
        skuNum = Math.ceil(skuNum) - good.skuNum;
      }
      try {
        await this.$store.dispatch("updateSkuNum", { skuId, skuNum });
        this.$message({
          type: "success",
          message: "修改成功",
        });
        this.getData();
      } catch (error) {
        this.$message({
          type: "error",
          message: "修改失败!",
        });
      }
    }, 2000),
    getData() {
      this.$store.dispatch("getUserCart");
    },
    remove(skuId) {
      this.$store.dispatch("removeGood", skuId).then(
        () => {
          this.getData();
          this.$message({
            type: "success",
            message: "删除成功",
          });
        },
        () => {
          this.$message({
            type: "error",
            message: "删除失败",
          });
        }
      );
    },
    //全选操作
    changeCheckeds() {
      let isChecked = event.target.checked ? 1 : 0;
      this.$store.dispatch("updateAllChecked", isChecked).then(
        () => {
          this.getData();
          this.$message({
            type: "success",
            message: "更新成功",
          });
        },
        () => {
          this.$message({
            type: "error",
            message: "更新失败",
          });
        }
      );
    },
    async removeAll() {
      try {
        await this.$store.dispatch("removeAllGood");
        this.getData();
        this.$message({
          type: "success",
          message: "删除成功!",
        });
      } catch (error) {
        this.$message({
          type: "error",
          message: "删除失败",
        });
      }
    },
  },
};
</script>

<style lang="less" scoped>
.cart {
  width: 1200px;
  margin: 0 auto;

  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }

  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;

      & > div {
        float: left;
      }

      .cart-th1 {
        width: 25%;

        input {
          vertical-align: middle;
        }

        span {
          vertical-align: middle;
        }
      }

      .cart-th2 {
        width: 25%;
      }

      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;
      }
    }

    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;

      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;

        & > li {
          float: left;
        }

        .cart-list-con1 {
          width: 15%;
        }

        .cart-list-con2 {
          width: 35%;

          img {
            width: 82px;
            height: 82px;
            float: left;
          }

          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }

        .cart-list-con3 {
          width: 20.8333%;

          .item-txt {
            text-align: center;
          }
        }

        .cart-list-con4 {
          width: 10%;
        }

        .cart-list-con5 {
          width: 17%;

          .mins {
            border: 1px solid #ddd;
            border-right: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }

          input {
            border: 1px solid #ddd;
            width: 40px;
            height: 33px;
            float: left;
            text-align: center;
            font-size: 14px;
          }

          .plus {
            border: 1px solid #ddd;
            border-left: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }
        }

        .cart-list-con6 {
          width: 10%;

          .sum {
            font-size: 16px;
          }
        }

        .cart-list-con7 {
          width: 13%;

          a {
            color: #666;
          }
        }
      }
    }
  }

  .cart-tool {
    overflow: hidden;
    border: 1px solid #ddd;

    .select-all {
      padding: 10px;
      overflow: hidden;
      float: left;

      span {
        vertical-align: middle;
      }

      input {
        vertical-align: middle;
      }
    }

    .option {
      padding: 10px;
      overflow: hidden;
      float: left;

      a {
        float: left;
        padding: 0 10px;
        color: #666;
      }
    }

    .money-box {
      float: right;

      .chosed {
        line-height: 26px;
        float: left;
        padding: 0 10px;
      }

      .sumprice {
        width: 200px;
        line-height: 22px;
        float: left;
        padding: 0 10px;

        .summoney {
          color: #c81623;
          font-size: 16px;
        }
      }

      .sumbtn {
        float: right;

        a {
          display: block;
          position: relative;
          width: 96px;
          height: 52px;
          line-height: 52px;
          color: #fff;
          text-align: center;
          font-size: 18px;
          font-family: "Microsoft YaHei";
          background: yellowgreen;
          overflow: hidden;
        }
      }
    }
  }
}
</style>
